Added support for CPU credits (#35)

* Added support for CPU credits

* Updated formatting

.pre-commit-config.yaml

 repos:
 - repo: git://github.com/antonbabenko/pre-commit-terraform
-  rev: v1.7.0
+  rev: v1.7.3
   hooks:
     - id: terraform_fmt
     - id: terraform_docs
 - repo: git://github.com/pre-commit/pre-commit-hooks
-  rev: v1.2.3
+  rev: v1.3.0
   hooks:
     - id: check-merge-conflict

README.md

@@ -89,6 +89,7 @@ data "aws_ami" "ubuntu-xenial" {
 |------|-------------|:----:|:-----:|:-----:|
 | ami | ID of AMI to use for the instance | string | - | yes |
 | associate_public_ip_address | If true, the EC2 instance will have associated public IP address | string | `false` | no |
+| cpu_credits | The credit option for CPU usage (unlimited or standard) | string | `standard` | no |
 | disable_api_termination | If true, enables EC2 Instance Termination Protection | string | `false` | no |
 | ebs_block_device | Additional EBS block devices to attach to the instance | string | `<list>` | no |
 | ebs_optimized | If true, the launched EC2 instance will be EBS-optimized | string | `false` | no |
@@ -119,6 +120,7 @@ data "aws_ami" "ubuntu-xenial" {
 | Name | Description |
 |------|-------------|
 | availability_zone | List of availability zones of instances |
+| credit_specification | List of credit specification of instances |
 | id | List of IDs of instances |
 | key_name | List of key names of instances |
 | network_interface_id | List of IDs of the network interface of instances |

examples/basic/README.md

@@ -24,6 +24,7 @@ Note that this example may create resources which can cost money. Run `terraform
 
 | Name | Description |
 |------|-------------|
+| credit_specification | Credit specification of EC2 instance |
 | id | List of IDs of instances |
 | instance_id | EC2 instance ID |
 | instance_public_dns | Public DNS name assigned to the EC2 instance |

examples/basic/outputs.tf

@@ -17,3 +17,8 @@ output "instance_public_dns" {
   description = "Public DNS name assigned to the EC2 instance"
   value       = "${module.ec2.public_dns[0]}"
 }
+
+output "credit_specification" {
+  description = "Credit specification of EC2 instance"
+  value       = "${module.ec2.credit_specification[0]}"
+}

main.tf

 ######
 # EC2 instance
+#
+# Note: network_interface can't be specified together with associate_public_ip_address
 ######
 resource "aws_instance" "this" {
   count = "${var.instance_count}"
@@ -30,10 +32,12 @@ resource "aws_instance" "this" {
   placement_group                      = "${var.placement_group}"
   tenancy                              = "${var.tenancy}"
 
-  # Note: network_interface can't be specified together with associate_public_ip_address
-  # network_interface = "${var.network_interface}"
+  credit_specification {
+    cpu_credits = "${var.cpu_credits}"
+  }
 
   tags = "${merge(var.tags, map("Name", var.instance_count > 1 ? format("%s-%d", var.name, count.index+1) : var.name))}"
+
   lifecycle {
     # Due to several known issues in Terraform AWS provider related to arguments of aws_instance:
     # (eg, https://github.com/terraform-providers/terraform-provider-aws/issues/2036)

outputs.tf

@@ -64,6 +64,11 @@ output "subnet_id" {
   value       = ["${aws_instance.this.*.subnet_id}"]
 }
 
+output "credit_specification" {
+  description = "List of credit specification of instances"
+  value       = ["${aws_instance.this.*.credit_specification}"]
+}
+
 output "tags" {
   description = "List of tags of instances"
   value       = ["${aws_instance.this.*.tags}"]

variables.tf

@@ -123,3 +123,8 @@ variable "network_interface" {
   description = "Customize network interfaces to be attached at instance boot time"
   default     = []
 }
+
+variable "cpu_credits" {
+  description = "The credit option for CPU usage (unlimited or standard)"
+  default     = "standard"
+}